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'99 - '06 GM Truck Modifications
Differential & Driveline
4L80 transmission shifts hard when at operating temperatures
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<blockquote data-quote="VH2K" data-source="post: 29893" data-attributes="member: 15488"><p>Realized I might have put this thread in the wrong section of the forum, so if any admin wants to move it, please do.</p><p></p><p>A small update:</p><p></p><p>Used the car for summer holidays, drove ~600km x 2, so from home to destination and back. Transmission does what it normally does, and starts shifting hard after a while. Hadn't really noticed before, since I mostly do highway driving when this happens, but 2nd-3rd is also a bit rough, but it happens later than 3rd-4th. However, I had to do some stop-start driving after driving for a long time and 1st-2nd is absolutely the worst, it was so bad I was afraid the transmission would fall off the truck. Oil seems good, both color and level. Maaaaybe a touch over the full-mark.</p><p></p><p>Anyway, if I stop the car, even just like a short stop just to fill gas or buy a drink or something, the transmission goes back to silky smooth when I start up again, and drives like this for a while before shifting hard again.</p><p></p><p>What could cause this? In my head this points to be more of an electrical/computer/signal fault than a hardware problem? Or no?</p></blockquote><p></p>
[QUOTE="VH2K, post: 29893, member: 15488"] Realized I might have put this thread in the wrong section of the forum, so if any admin wants to move it, please do. A small update: Used the car for summer holidays, drove ~600km x 2, so from home to destination and back. Transmission does what it normally does, and starts shifting hard after a while. Hadn't really noticed before, since I mostly do highway driving when this happens, but 2nd-3rd is also a bit rough, but it happens later than 3rd-4th. However, I had to do some stop-start driving after driving for a long time and 1st-2nd is absolutely the worst, it was so bad I was afraid the transmission would fall off the truck. Oil seems good, both color and level. Maaaaybe a touch over the full-mark. Anyway, if I stop the car, even just like a short stop just to fill gas or buy a drink or something, the transmission goes back to silky smooth when I start up again, and drives like this for a while before shifting hard again. What could cause this? In my head this points to be more of an electrical/computer/signal fault than a hardware problem? Or no? [/QUOTE]
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'99 - '06 GM Truck Modifications
Differential & Driveline
4L80 transmission shifts hard when at operating temperatures
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